Kernel adaptive filtering-based phase noise compensation for pilot-free optical phase conjugated coherent systems

Sonia Boscolo*, Thanh Tu Nguyen, Abdallah Ali, Stylianos Sygletos, Andrew D. Ellis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We propose a kernel-based adaptive filtering method to suppress the phase noise (PN) arising from small deviations from ideal counter-phasing in the dual-pump fibre-based optical phase conjugation (OPC) of pilot-free quadrature-amplitude modulation (QAM) signals. We demonstrate experimentally and numerically that the proposed scheme achieves signal-to-noise ratio improvement over conventional PN compensation under optimised pump dithering settings in the OPC device and features no performance penalty across a range of pump-phase mismatch values, when it is used with a 16-QAM signal in an optical back-to-back configuration. We also illustrate the applicability of the method to the 64-QAM modulation format, and evaluate its performance in a transmission setup with mid-link OPC by means of numerical simulations.
Original languageEnglish
Pages (from-to)19479-19493
Number of pages15
JournalOptics Express
Volume30
Issue number11
DOIs
Publication statusPublished - 23 May 2022

Bibliographical note

Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Funding: UK Engineering and Physical Sciences Research Council ( EP/S003436/1 (PHOS), EP/S016171/1 (EEMC),
EP/R035342/1 (TRANSNET)).

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